Battle of Thule (Great Sith War)
Following the conclusion of the Great Sith War, a significant conflict unfolded on the world of Thule. In this engagement, the forces of the Galactic Republic, aided by the ex-Sith Lord known as Ulic Qel-Droma, successfully neutralized the Dark Reaper, a formidable Sith superweapon.
Behind the scenes
The New Essential Chronology states that the Dark Reaper was unleashed upon Raxus Prime, and its eventual destruction also took place on that very planet.